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The novel follows Harper, the outsider in the family, due to the fact that she’s never married nor had children.

Now the gap between adults and children isn't just generational - it's divided between those who remember life pre-outbreak and those born post-virus.

After Mr Buss died in 2013, ownership was passed to his six children in a trust.

The structure of the trust meant the majority of Buss’ six children would need to agree for a sale to occur.

Ada, 11, said she was concerned air pollution would affect herself and her friends with asthma as "children's bodies are still growing".